Furnace



May 22, 1928. 1,670,754

H. w. THr-:lss FURNACE..

Filed May 23, 1927 2 Sheets-Sheet 1 j y g TJV IN V EN TOR.

G ---RNEYS May 22, 1928.

H. W. THEISS FURNACE Filed May :23, 1927 2 Sheets-Sheet 2 INVEN TOR.

/7-12" A TTORNE YS.

Patented May 22, 1928.

UNITED STATES PATENT OFFICE.

HARRY W. TBEISS,

IPAN'Y, OF CANTON, OHIO,

A CORPORATION OF OHIO.

I FURNACE.

application mea may 2s,

This invention has reference to furnaces and, particularly, to the muiiie type, especially adapted for heat-treating zinc coated materials.

It is an object of the invention that' the furnace herein disclosed is adapted for carrying out the heat-treating process de' scribed and'claimed in Letters Patent to J.'L. Herman, No. 1,430,648, dated the 3rd 1 da of October, 1922.

'ly'he invention has for its principal object to provide a heat-treating furnace, adapted especially for heat-treating zinc coated materials, and which is capable of being moved u next adjacent to or away from the galvanizing potcontainingxthe zinc coating bath; whereb the furnace, or the pot, or both may be repaired, or for other purposes, as the case may be. The material receivin end of the furnace being inclined; where y, when it is next adjacent the galvanizing pot it overlies such pot, enablin the transfer of the zinc coated materials om said pot to said furnace within a minimum amount of time,

f during which interval the coating has had little time to set, and in the case of sheets before the formation of a Spangled surface. The resulting action of the heat-treatment by the furnace 1s to provide a tighter coat of the coating on and with the material; to evenly distribute the-coating on the material and form an iron-zinc alloy, which gives the coating its physical properties.

. The invention further comprehends a furnace e cially adapted for theheat-treatment o zinc coated sheets; an improved supporting means therefor, and an improvement in the transfer of heat to the exposed surfaces of the sheets an'd gradual 40 cooling of the sheets as they leave the furnace.

That the invention ma be more fully understood, reference isha to the accompanying drawin forming a'\part of th1s de- 45 scription, il ustrating a preferred embodiment of the invention, in which Fig. 1 is a'diagrammatic view, partly in l section, showmg a method of zinc coating 1927. Serial No.l 193,553.

sheets and heat-treating such sheets by the use of my improved furnace;

Fig. 2 is a plan View, partly .in section, of the furnace;

Fi 3 is a longitudinal sectional view thru y the urnace, also showing its relation to a galvanizing pot;

` Fig. 4 is a transverse sectional view thru the furnace, and Y Fig. 5 is a cross-section of the arched roof of the receiving end of the muie portion of the furnace.

Like ch racters denote corresponding parts thruout the figures.

In the drawings, the diagrammatic arrangement shown in Fig. 1, includes an acid tank a, a galvanizing pot 72 suitable for containing a zinc coating bath, and so constructed interiorly as to permit of the passage of sheets from the acid tank, thru said pot and to the furnace embodying my invention, normally disposed next adjacent thereto thru which the coated sheets are conveyed or conducted by the endless conveyer chains 2 and delivered to the usual cooling wheelc. During the passa of the coated sheets thru the furnace, t cheattreatment, to which such coated sheets are submitted, provides a tight coat of the coat on the sheet and with the sheet; prevents spangling of the coating; distributes the coating evenly on the sheets and helps form an iron-zinc allo which gives the coating on the sheet its p ysical properties.

The furnace portions which are subjected' to excessive heat are preferabl constructed of suitable refractory materia It is constructed with an arched roof 3 extending thruout the length of the furnace and overl ing the muiile portion 4; also extendin thruout the furnace and open at each en At the receiving end arched roof 3 extends forward of the mule and provides an overhanging portion 5, to insure an immediate application of heat to the coated sheets as they leave the coating bath and are transferred to such for treatment. The

oor 6 of the mule',

of the furnace theV furnace beneath the lloor from its open receiving end to a point a roximating the inner end of the lire-box eneath the rearend portionof the mame, is provided with the series of pairs of oppositely disposed and laterally'. extended spaced openin s or passages 8, each communicating wit a port 9 extending inwardly 6. The ports 9 en opposite sides of the furnace communicate with chambers l0, 10 dividedV by a partition wall 11, which terminates at its inner end at the inner end of the lire-box 7 and the latter has an arched roof wall 12. Also, on the Hoor 6 are provided the spaced longitudinal runways 13, preferably channel bars with the flanges turned upwardly, thru which the conveyer chains 2 move as they traverse the muiiie 4 of the furnace, and said chains are adapted to receive the coated sheets from the ot b and conve the same to and thru the urnace and to tlie cooling wheel c.

The base Wall 14 for they furnaceyextends thruout the length of the lire-box 7 and chamber 10, and for a portion of the len h of the chamber 10, starting at the receivlng end of said furnace immediately below the mullle, said wall is inclined downwardly and rearwardly, as at 15, to a point near the inner end of saidchamber 10, where such inclined wall terminates in and becomes the Wall 14. At the rear or discharge end of the furnace, and in communication with the lirebox 7, there is provided a combustion port 16 into which would project 'a suitable burner, not shown. l

he furnace walls are connected and Abraced by any suitable steel structure, and vI prefer toy face the lower outside face of the base wall 14 with a sheet metal covering 17.

This covering, together with channel beams 18, set in the wal 14 and inclined portion 15, and longitudinally of and below the beam 13, form or provide return run-ways for the chains 2. These chains at the front or receivinr end of the furnace are directed over sproclet wheels 19 carried by a shaft 20, journaled in any suitablesupports, and at the rear or discharge end of the furnace are directed over sprocket wheels 21 carried by a sha-ft 22, journaled in any suitable suports. Either of the shafts 20 or 22 may e the operating shaft, and as such, arranged to receive power from any suitable source. That portion of the chains traversing the inclined portion 15 of the base wall of -the furnace, is directed by guide rollers 23, between the sprocket wheels 20 and the runwa s formed by the channel bars 18. p

Xn under steel structure for; the furnace, comprises a plurality of longitudinally and horizontally disposed and spaced I beams 24, which exten'd forward from the rear or discharge end of the furnace to a point short of t e front or receiving end thereof and mediate the inclined portion 15, and suitably connected to and braced from the steel bracing structure of the furnace.

en the furnace is set up for operation in a mill the I beams 24 rest and are adapted to have movement on the plurality of transversely disposed rollers 25 which rest and are adapted to have rolling movement on the door rails 26. In this manner and by these last mentioned elements the furnace may be easily and quickly moved adjacent to or away from the pot b, for purposes of repair of either or both the pot and furnace; the inclined base wall structure for the receiving end of the furnace permitting that portion of the furnace muilie to be moved to posi.- tion overlying the pot b for the purposes above explained. h

The products of combustion traverse fire-box 7 and chamber 10 and up and out thru the orts 9 and openings 8 into the muille, lin ing egress at the entrance end for the sheets into the furnace and also up and out thru exit openings 27 formed or provided in the arched roof 3. Such arrangement of exhaust openings or passages for the products of combust1on provides for the application of the heat, at the maximum temperature, at the entrance end of the kfurnace and for an approximately even distribution of such heat to the sheets, the sheets gradually cooling toward the rear or discharge end of the mulile.

What I claim is i 1. A furnace for heat-treatin zinc-coated metallic materials, includinga eat-treating chamber open at both ends, a fire-box therebeneath, a partitioned chamber, also, therebeneath in communication with said lire-box and having communication with said heattreating chamber thru a `plurality of combustion passa eways, an endless carrier'movable thru sai heat-treating chamber, guideways for said carrier in said heat-treating chamber and below said furnace, and exhaust ports in the top wall of said furnace adjacent its receiving end and in communication with said heat-treating chamber, said top wall having an over-handging portion at the receiving end of sai chamber.

2. A furnacefor heat-treatin zinc-coated metallic materials, including a eat-treatin chamber open at bothl ends and4 partitione from a combustion conducting chamber therebeneath, combustion passageways between said chamber and heat-treating chamber in the forward or receiving end of said furnace, an inclined body portion to adapt said furnace to overlieA a ,coating means, an endless carrier having its conveying run in heat-treating -the heat-treating chamber and its return run beneath Ithe furnace, and ide ways for said carrierv in the heat-treating chamber and l beneath the furnace. 3. furnace for heat-treating zinc-coated metallic materials, comprising a body, the receiving end of which has an inclined base portion to adapt the same to overlie a coating means, said body being partitioned to provide a longitudinal heat-treating chamber open at both ends and an underlying cornbustion chamber, passage Ways connecting said chamber' and heat-treating chamber,

exit openings in the top wall of said bod a carrier for conducting coated materia s thru said heat-treating chamber, and supporting means for said furnace adapting it to be moved bodily7 next adjacent a coating means and removed therefrom.

HARRY W. THEISS. 

